Looking for a SWPPP consultant in Castle Rock, CO? Describe your project once and up to three stormwater consultants who work in Castle Rock and Douglas County get back to you with a quote. It's free and there is no obligation.
Castle Rock is home to about 83,213 people (2024 Census Bureau estimate), a growing community (+13.7% since 2020). With 2,395 people per sq mi, it is a suburban area. Subdivisions and commercial sites here need stormwater permit coverage before grading.
Castle Rock at a glance
- Population (Census Bureau estimate, 2024)
- 83,213 (+13.7% since 2020)
- Rank in Colorado
- 14th of 271 cities and towns
- Land area
- 35 sq mi
- Population density
- 2,395 people per sq mi (suburban)
- Type
- Town (Castle Rock town)
- Main county
- Douglas County
What to check before hiring in Castle Rock
- Permit: in Colorado, check the state construction general permit.
- Local rules: Castle Rock may add its own erosion control permit.
- Records: keep inspection reports on site.
- Price drivers: site size, phases, inspection frequency and duration.
Useful official resources
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EPA: construction stormwater
Official information and guidance.
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EnviroCert: CPESC
Official information and guidance.
Services available in Castle Rock
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SWPPP and permit coverage
Preparation of the SWPPP and notice of intent under the construction general permit.
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Stormwater inspections
Routine and post-storm inspections with reports for the permit.
Frequently asked questions in Castle Rock
How much does a SWPPP cost in Castle Rock, CO?
It depends on site size, phases and inspections. Describe your project: consultants who serve Castle Rock reply with a quote.
How long does it take?
Plans often take days to a couple of weeks, plus the permit review.
What happens at the end?
A notice of termination is filed once the site is stabilized.
Which stormwater consultants will contact me?
Up to three independent stormwater consultants who serve Castle Rock and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.